CN112180222A - System and method for cable material insulation performance test - Google Patents
System and method for cable material insulation performance test Download PDFInfo
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- CN112180222A CN112180222A CN202010870726.6A CN202010870726A CN112180222A CN 112180222 A CN112180222 A CN 112180222A CN 202010870726 A CN202010870726 A CN 202010870726A CN 112180222 A CN112180222 A CN 112180222A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
Abstract
The invention discloses a system and a method for testing the insulating property of a cable material, wherein the system comprises the following steps: the device comprises a high-voltage generator, a control platform, a metal clamp, a cable bracket, a feed-through transformer, a temperature measuring unit and a test model cable; peeling and cutting the outer protective layer of the test model cable and the metal shielding layer of the test model cable at two ends of the test model cable according to a first length threshold value, and cutting the insulating layer of the test model cable according to a second length threshold value; the test model cable is arranged on the cable support, penetrates through the core-through transformer and heats a conductor of the test model cable according to the instruction of the control platform; the test model cable is connected with the temperature measuring unit, and the temperature of the conductor of the test model cable is determined through the temperature measuring unit; and the conductors at the two ends of the test model cable are fixed by metal clamps, and are connected with a high-voltage generator, and the high-voltage generator outputs voltage according to the instruction of the control platform.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a system and a method for testing the insulation performance of a cable material.
Background
At present, the technical routes of cable insulating materials mainly include an insulating material blending technology based on an ultra-clean base material and an insulating material modification technology based on nanometer doping. The cable base stock LS4258DCE developed by northern Europe chemical industry, and 525kV XLPE cable system was successfully developed by ABB in 2015 based on LS4258 DCE. Japanese researchers developed 500kV XLPE high-voltage cables based on nanometer modification technology, but none of them were put into practical use. At present, 535kV cables based on domestic materials are developed in China, and it is found that the breakdown performance of the materials under a flat plate can only be reflected by the breakdown performance of a flat plate sample, and an effective characterization relation cannot be established between the electrical performance of the flat plate sample and a type test of a true cable; if the cable is processed and then a type test is carried out for verification, a terminal joint is needed, the installation time is long, and the cost is overlarge. Therefore, a test method capable of reflecting the electrical performance of the real cable is urgently needed between the flat plate sample and the real cable.
Disclosure of Invention
The technical scheme of the invention provides a system and a method for testing the insulating property of a cable material, which aim to solve the problem of how to test the insulating property of the cable material.
In order to solve the above problems, the present invention provides a system for testing insulation performance of a cable material, the system comprising: the device comprises a high-voltage generator, a control platform, a metal clamp, a cable bracket, a feed-through transformer, a temperature measuring unit and a test model cable;
peeling and cutting the outer protective layer of the test model cable and the metal shielding layer of the test model cable at two ends of the test model cable according to a first length threshold, and cutting the insulating layer of the test model cable according to a second length threshold;
the test model cable is arranged on the cable support, penetrates through the feedthrough transformer and heats a conductor of the test model cable according to the instruction of the control platform;
the test model cable is connected with the temperature measuring unit, and the temperature of the conductor of the test model cable is determined through the temperature measuring unit;
and the conductors at the two ends of the test model cable are fixed by the metal clamp, and are connected with the high-voltage generator, and the high-voltage generator outputs voltage according to the instruction of the control platform.
Preferably, the test model cable is connected to the temperature measuring unit, and the temperature of the conductor of the test model cable is determined by the temperature measuring unit, including:
and installing a temperature thermocouple on the outer protective layer of the test model cable, connecting the temperature thermocouple with the temperature measuring unit, and determining the temperature of the conductor of the test model cable according to the temperature of the temperature thermocouple.
Preferably, the high voltage generator continuously boosts voltage within a preset voltage threshold range.
Preferably, the method comprises the following steps: when the temperature of the conductor of the test model cable reaches the working temperature, keeping the temperature of the conductor of the test model cable at the working temperature;
and the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate.
Preferably, the method comprises the following steps: when the test model cable is subjected to surface flashover, recording flashover voltage Us of the test model cable, and cutting off the voltage of the high-voltage generator;
after an insulating layer of the test model cable is cut, when the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate until the test model cable is broken down, recording the breakdown voltage Uc of the test model cable;
when the breakdown voltage Uc is smaller than the flashover voltage Us, the electric strength of the test model cable is the flashover voltage Us;
and when the breakdown voltage Uc is greater than the flashover voltage Us, the electric strength of the test model cable is the breakdown voltage Uc.
Based on another aspect of the present invention, the present invention provides a method for testing insulation performance of a cable material, including establishing a testing system, where the testing system includes: the device comprises a high-voltage generator, a control platform, a metal clamp, a cable bracket, a feed-through transformer, a temperature measuring unit and a test model cable;
peeling off and cutting the outer protective layer of the test model cable and the metal shielding layer of the test model cable at two ends of the test model cable according to a first length threshold, and cutting off and cutting the insulating layer of the test model cable according to a second length threshold;
installing the test model cable on the cable support, wherein the test model cable penetrates through the feedthrough transformer, and the temperature of a conductor of the test model cable is raised through the feedthrough transformer according to an instruction of the control platform;
connecting the test model cable with the temperature measuring unit, and determining the temperature of the conductor of the test model cable through the temperature measuring unit;
and fixing the conductors at the two ends of the test model cable by using the metal clamp, connecting the conductors at the two ends of the test model cable with the high-voltage generator, and outputting voltage by the high-voltage generator according to the instruction of the control platform.
Preferably, the test model cable is connected to the temperature measuring unit, and the temperature of the conductor of the test model cable is determined by the temperature measuring unit, including:
and installing a temperature thermocouple on the outer protective layer of the test model cable, connecting the temperature thermocouple with the temperature measuring unit, and determining the temperature of the conductor of the test model cable according to the temperature of the temperature thermocouple.
Preferably, the high voltage generator continuously boosts voltage within a preset voltage threshold range.
Preferably, the method comprises the following steps: when the temperature of the conductor of the test model cable reaches the working temperature, keeping the temperature of the conductor of the test model cable at the working temperature;
and the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate.
Preferably, the method comprises the following steps: when the test model cable is subjected to surface flashover, recording flashover voltage Us of the test model cable, and cutting off the voltage of the high-voltage generator;
after an insulating layer of the test model cable is cut, when the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate until the test model cable is broken down, recording the breakdown voltage Uc of the test model cable;
when the breakdown voltage Uc is smaller than the flashover voltage Us, the electric strength of the test model cable is the flashover voltage Us;
and when the breakdown voltage Uc is greater than the flashover voltage Us, the electric strength of the test model cable is the breakdown voltage Uc.
The technical scheme of the invention provides a system and a method for testing the insulating property of a cable material, wherein the system comprises: the device comprises a high-voltage generator, a control platform, a metal clamp, a cable bracket, a feed-through transformer, a temperature measuring unit and a test model cable; peeling and cutting the outer protective layer of the test model cable and the metal shielding layer of the test model cable at two ends of the test model cable according to a first length threshold value, and cutting the insulating layer of the test model cable according to a second length threshold value; the test model cable is arranged on the cable support, penetrates through the core-through transformer and heats a conductor of the test model cable according to the instruction of the control platform; the test model cable is connected with the temperature measuring unit, and the temperature of the conductor of the test model cable is determined through the temperature measuring unit; and the conductors at the two ends of the test model cable are fixed by metal clamps, and are connected with a high-voltage generator, and the high-voltage generator outputs voltage according to the instruction of the control platform. The test model cable of the technical scheme of the invention is designed by adopting an equal field intensity principle, so that the performance test of the test model cable is closest to that of an actual cable, the electric endurance test of the test model cable can effectively reflect the comprehensive electrical reliability such as the dielectric property, the processability and the like of a cable insulating material, and the integral evaluation basis can be provided for the reliability of the cable in the development process.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a system configuration diagram for cable material insulation performance test according to a preferred embodiment of the present invention; and
FIG. 2 is a diagram of a test model cable configuration according to a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional view of a test model cable according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a test model cable parametric analysis of 3 different insulation materials according to a preferred embodiment of the present invention; and
fig. 5 is a flow chart of a method for testing the insulation performance of the cable material according to the preferred embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a system configuration diagram for cable material insulation performance test according to a preferred embodiment of the present invention. As shown in fig. 1, the present invention provides a system for testing insulation performance of cable material, the system comprising: the device comprises a high-voltage generator, a control platform, a metal clamp, a cable support, a feed-through transformer, a temperature measuring unit and a test model cable.
In order to test the insulation performance of the cable material, the invention provides a comprehensive performance characterization platform and a comprehensive performance characterization method of model cables for different insulation materials and production processes, and the comprehensive performance characterization platform and the comprehensive performance characterization method of the model cables are composed of a high-voltage generator 1, a control platform 2, a metal clamp 3, a cable support 4, a feed-through transformer 5, a temperature measurement unit 7 and a model cable 6 for testing.
In fig. 2, the test model cable 8 is an unpeeled segment; 9. stripping and cutting a sheath section of the cable; 10. stripping and cutting an outer shielding section of the cable; 11. a cable shielding fracture;
in fig. 3, 12, cable conductor; 13. an insulating layer; 14. cable shields and 15, cable outer sheath.
And after the outer protective layer of the test model cable and the metal shielding layer of the test model cable are stripped and cut at two ends of the test model cable according to a first length threshold, and the insulating layer of the test model cable is cut according to a second length threshold. Firstly, stripping and cutting 15-outer protective layers and 14-shielding layers at two ends of a 6-model cable for a certain length according to requirements, and then installing the 6-model cable on a 4-cable bracket, wherein the vertical distance between the 4-cable bracket and the ground is about 2 m; the middle of the model cable passes through a 5-feedthrough transformer and is used for heating a cable conductor; a temperature thermocouple is arranged on the surface of the cable outer sheath and connected to a 7-temperature measurement system, and the 12-cable conductor is subjected to simulation temperature control; the conductors at the two ends of the cable were fixed with a 3-metal clamp, connected to a 1-high voltage generator and a 2-control platform, and pressurized according to the test method.
According to the invention, the outer sheath and the metal shielding layer are stripped and cut at two ends of the model cable for the test by 1.2m, and the semi-conducting layer on the outer insulating surface is cut by a glass sheet, the length is 1m, so that the surface flashover under voltage is prevented; the cable support of the invention has the height of 2m, is provided with a metal ring for limiting the movement of the model cable, and is placed 0.3m below a cable shielding fracture.
The test model cable is arranged on the cable support, penetrates through the feed-through transformer and heats the conductor of the test model cable according to the instruction of the control platform.
The test model cable is connected with the temperature measuring unit, and the temperature of the conductor of the test model cable is determined through the temperature measuring unit; preferably, the test model cable is connected with a temperature measuring unit, and the temperature of the conductor of the test model cable is determined by the temperature measuring unit, including: and installing a temperature thermocouple on the outer protective layer of the test model cable, connecting the temperature thermocouple with the temperature measuring unit, and determining the temperature of the conductor of the test model cable according to the temperature of the temperature thermocouple.
The feed-through transformer can feed current into a test model cable and is controlled by the temperature measuring unit, so that the temperatures of the main loop and the simulation loop are consistent.
And the conductors at the two ends of the test model cable are fixed by metal clamps, and are connected with a high-voltage generator, and the high-voltage generator outputs voltage according to the instruction of the control platform.
According to the invention, a test model cable is arranged on a cable support, and the vertical distance between the test model cable and the ground reaches about 2 m; the middle part of the cable penetrates through the core-through transformer and is used for heating a cable conductor; the surface of the cable outer sheath is provided with a temperature thermocouple and is connected to a temperature measuring unit, and the temperature of the cable conductor is controlled in a simulation way; and fixing the conductors at two ends of the cable by using a metal clamp, connecting the conductors with the high-voltage generator and the control platform, and pressurizing according to a test method.
Preferably, the high voltage generator is continuously boosted within a preset voltage threshold range.
Preferably, when the temperature of the conductor of the test model cable reaches the working temperature, the temperature of the conductor of the test model cable is maintained at the working temperature; the high voltage generator continuously boosts voltage according to boosting rate within a preset voltage threshold range.
Preferably, the method comprises the following steps: when the test model cable is subjected to surface flashover, recording the flashover voltage Us of the test model cable, and cutting off the voltage of the high-voltage generator;
after an insulating layer of the test model cable is cut, when the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate until the test model cable is broken down, recording the breakdown voltage Uc of the test model cable;
when the breakdown voltage Uc is smaller than the flashover voltage Us, the electric strength of the test model cable is the flashover voltage Us;
and when the breakdown voltage Uc is greater than the flashover voltage Us, the electric strength of the test model cable is the breakdown voltage Uc.
The metal clamp can be a jointing clamp, and is arranged on the conductors at two ends of the cable and used for fixing the cable and maintaining the equipotential of the cable conductors;
the high-voltage generator can boost voltage within the range of 0-1000 kV, is provided with a protection system, can be connected to a metal clamp through a thin wire, and pressurizes a cable conductor.
The test method of the invention is that the outer sheath of the cable sample is reliably grounded and connected with a high voltage generator; heating the cable sample to the working temperature, and measuring the temperature by adopting an analog loop; the invention keeps the temperature constant, increases the voltage applied on the sample until the cable breaks down, the voltage increase rate is 5kV/s, and adopts the positive polarity voltage. The invention is exemplified by measuring 6 model cable samples and the dielectric strength test results are processed according to a three parameter Weibull distribution.
And if the test is carried out, the surface flashover voltage Us of the sample is recorded, the high voltage is removed, the insulation shield is polished again, the voltage is applied until the cable is broken down, and the breakdown voltage Uc is recorded.
In the invention, insulation damage caused by flashover is considered, and if Uc < Us (highest flashover voltage), the electric strength U of the model cable sample is equal to Us; if Uc > Us, the electric strength U of the model cable sample is equal to Uc.
In order to prevent the surface flashover, the invention adopts a continuous boosting mode to avoid the charge accumulation on the surface of the cable.
According to the invention, when the breakdown probability of the insulating material sample is 63.2%, measurement data of different samples are processed by using Weibull analysis.
As shown in FIG. 4, the invention performs analysis on model cable samples of 3 different insulating materials, and when the breakdown probability is 63.2%, the measurement data of different samples are processed by Weibull analysis to obtain shape parameters and dimension parameters.
According to the invention, from Weibull distribution, the scale parameters and the shape parameters of the breakdown voltage of the insulating material A model cable are larger, which indicates that the cable has stronger voltage endurance capability and better material performance consistency, and the cable does not have obvious breakdown weakness; on the contrary, the scale parameters and the shape parameters of the breakdown voltage of the insulating material C model cable are small, which indicates that the insulating material C model cable has obvious weak points inside and is dispersed, and the voltage-resistant capability of the insulating material C model cable is seriously influenced; the scale parameter of the breakdown voltage of the insulating material B model cable is greatly improved compared with that of the insulating material C, but the voltage endurance capability of the insulating material B model cable is not as good as that of the insulating material A.
Fig. 5 is a flow chart of a method for testing the insulation performance of the cable material according to the preferred embodiment of the invention. As shown in fig. 5, the present invention provides a method for testing insulation performance of cable material, including establishing a testing system, where the testing system includes: the device comprises a high-voltage generator, a control platform, a metal clamp, a cable bracket, a feed-through transformer, a temperature measuring unit and a test model cable;
in step 501: peeling and cutting the outer protective layer of the test model cable and the metal shielding layer of the test model cable at two ends of the test model cable according to a first length threshold value, and cutting the insulating layer of the test model cable according to a second length threshold value;
in step 502: and installing the test model cable on the cable support, enabling the test model cable to pass through the feed-through transformer, and heating the conductor of the test model cable through the feed-through transformer according to the instruction of the control platform. Preferably, the test model cable is connected with a temperature measuring unit, and the temperature of the conductor of the test model cable is determined by the temperature measuring unit, including: and installing a temperature thermocouple on the outer protective layer of the test model cable, connecting the temperature thermocouple with the temperature measuring unit, and determining the temperature of the conductor of the test model cable according to the temperature of the temperature thermocouple.
In step 503: connecting the test model cable with a temperature measuring unit, and determining the temperature of a conductor of the test model cable through the temperature measuring unit;
in step 504: and fixing the conductors at the two ends of the test model cable by using a metal clamp, connecting the conductors at the two ends of the test model cable with a high-voltage generator, and outputting voltage by the high-voltage generator according to the instruction of the control platform.
Preferably, the high voltage generator is continuously boosted within a preset voltage threshold range.
Preferably, the method comprises the following steps: when the temperature of the conductor of the test model cable reaches the working temperature, keeping the temperature of the conductor of the test model cable at the working temperature; the high voltage generator continuously boosts voltage according to boosting rate within a preset voltage threshold range.
Preferably, the method comprises the following steps: when the test model cable is subjected to surface flashover, recording the flashover voltage Us of the test model cable, and cutting off the voltage of the high-voltage generator;
after an insulating layer of the test model cable is cut, when the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate until the test model cable is broken down, recording the breakdown voltage Uc of the test model cable;
when the breakdown voltage Uc is smaller than the flashover voltage Us, the electric strength of the test model cable is the flashover voltage Us;
and when the breakdown voltage Uc is greater than the flashover voltage Us, the electric strength of the test model cable is the breakdown voltage Uc.
The method for testing the insulation performance of the cable material in the preferred embodiment of the invention corresponds to the system for testing the insulation performance of the cable material in another preferred embodiment of the invention, and details are not repeated herein.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. A system for testing the insulation properties of a cable material, the system comprising: the device comprises a high-voltage generator, a control platform, a metal clamp, a cable bracket, a feed-through transformer, a temperature measuring unit and a test model cable;
peeling and cutting the outer protective layer of the test model cable and the metal shielding layer of the test model cable at two ends of the test model cable according to a first length threshold, and cutting the insulating layer of the test model cable according to a second length threshold;
the test model cable is arranged on the cable support, penetrates through the feedthrough transformer and heats a conductor of the test model cable according to the instruction of the control platform;
the test model cable is connected with the temperature measuring unit, and the temperature of the conductor of the test model cable is determined through the temperature measuring unit;
and the conductors at the two ends of the test model cable are fixed by the metal clamp, and are connected with the high-voltage generator, and the high-voltage generator outputs voltage according to the instruction of the control platform.
2. The system of claim 1, the test model cable connected to the temperature measurement unit, the temperature of the conductor of the test model cable being determined by the temperature measurement unit, comprising:
and installing a temperature thermocouple on the outer protective layer of the test model cable, connecting the temperature thermocouple with the temperature measuring unit, and determining the temperature of the conductor of the test model cable according to the temperature of the temperature thermocouple.
3. The system of claim 1, wherein the high voltage generator is configured to continuously boost within a predetermined voltage threshold.
4. The system of claim 1, comprising: when the temperature of the conductor of the test model cable reaches the working temperature, keeping the temperature of the conductor of the test model cable at the working temperature;
and the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate.
5. The system of claim 1, comprising: when the test model cable is subjected to surface flashover, recording flashover voltage Us of the test model cable, and cutting off the voltage of the high-voltage generator;
after an insulating layer of the test model cable is cut, when the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate until the test model cable is broken down, recording the breakdown voltage Uc of the test model cable;
when the breakdown voltage Uc is smaller than the flashover voltage Us, the electric strength of the test model cable is the flashover voltage Us;
and when the breakdown voltage Uc is greater than the flashover voltage Us, the electric strength of the test model cable is the breakdown voltage Uc.
6. A method for testing the insulation performance of a cable material, comprising establishing a testing system comprising: the device comprises a high-voltage generator, a control platform, a metal clamp, a cable bracket, a feed-through transformer, a temperature measuring unit and a test model cable;
peeling off and cutting the outer protective layer of the test model cable and the metal shielding layer of the test model cable at two ends of the test model cable according to a first length threshold, and cutting off and cutting the insulating layer of the test model cable according to a second length threshold;
installing the test model cable on the cable support, wherein the test model cable penetrates through the feedthrough transformer, and the temperature of a conductor of the test model cable is raised through the feedthrough transformer according to an instruction of the control platform;
connecting the test model cable with the temperature measuring unit, and determining the temperature of the conductor of the test model cable through the temperature measuring unit;
and fixing the conductors at the two ends of the test model cable by using the metal clamp, connecting the conductors at the two ends of the test model cable with the high-voltage generator, and outputting voltage by the high-voltage generator according to the instruction of the control platform.
7. The method of claim 6, wherein the test model cable is connected to the temperature measurement unit, and wherein determining the temperature of the conductor of the test model cable via the temperature measurement unit comprises:
and installing a temperature thermocouple on the outer protective layer of the test model cable, connecting the temperature thermocouple with the temperature measuring unit, and determining the temperature of the conductor of the test model cable according to the temperature of the temperature thermocouple.
8. The method of claim 6, wherein the high voltage generator is continuously boosted within a predetermined voltage threshold.
9. The method of claim 6, comprising: when the temperature of the conductor of the test model cable reaches the working temperature, keeping the temperature of the conductor of the test model cable at the working temperature;
and the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate.
10. The method of claim 6, comprising: when the test model cable is subjected to surface flashover, recording flashover voltage Us of the test model cable, and cutting off the voltage of the high-voltage generator;
after an insulating layer of the test model cable is cut, when the high-voltage generator continuously boosts voltage within a preset voltage threshold range according to the boosting rate until the test model cable is broken down, recording the breakdown voltage Uc of the test model cable;
when the breakdown voltage Uc is smaller than the flashover voltage Us, the electric strength of the test model cable is the flashover voltage Us;
and when the breakdown voltage Uc is greater than the flashover voltage Us, the electric strength of the test model cable is the breakdown voltage Uc.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113376489A (en) * | 2021-06-22 | 2021-09-10 | 广州万宝电子材料有限公司 | Insulated wire voltage withstand test method and test tool thereof |
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| CN204012599U (en) * | 2014-07-18 | 2014-12-10 | 开平市翰联电力设计有限公司 | A kind of tower apparatus of stepping on based on dry-type cable terminal |
| CN107782970A (en) * | 2017-09-29 | 2018-03-09 | 国网浙江省电力公司舟山供电公司 | The detecting system and method for direct current cables insulating barrier DC conductance under operating condition |
| CN110031731A (en) * | 2019-04-10 | 2019-07-19 | 上海交通大学 | Puncture test macro and method for cables with extruded insulation direct current |
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